diff --git a/apps/common/main/lib/component/ComboBox.js b/apps/common/main/lib/component/ComboBox.js
index 6d69b4633..b58daa032 100644
--- a/apps/common/main/lib/component/ComboBox.js
+++ b/apps/common/main/lib/component/ComboBox.js
@@ -190,6 +190,7 @@ define([
                         el.on('click', '.form-control', _.bind(this.onInputClick, this));
                         this._input.attr('readonly', 'readonly');
                         this._input.attr('data-can-copy', false);
+                        this._input.on('mousedown',function (e){e.preventDefault();})
                     }
 
                     if (me.options.hint) {